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| DOI：10.13522/j.cnki.ggps.2024377 |
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| Cause analysis and zoning-based management of typical saline soils at the western foot of Helan Mountain |
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WANG Kai, TAO Yuan, DONG Qin’ge, LIU Yong, ZHANG Dequan, MIAO Ping, MA Hongli
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1. College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling 712100, China;
2. China Institute of Water Resources and Hydropower Research, Beijing 100048, China;
3. College of Water and Soil Conservation Science and Engineering, Northwest A&F University, Yangling 712100, China;
4. Ordos Water Conservancy Development Center, Ordos 017002, China;
5. Ordos River and Lake Protection Center, Ordos 017000, China
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| Abstract: |
| 【Objective】The expansion of saline soils at the western foot of Helan Mountain, particularly in Alashan Left Banner, poses significant threats to agriculture and ecosystem health. This study systematically analyzes the causes of soil salinization in this region and proposes mitigation strategies.【Method】The research focused on two key irrigation areas: Yaoba Oasis, which relies on groundwater for irrigation, and the Luanjingtan Yellow River Irrigation Area, which utilizes Yellow River water for irrigation. Both natural factors, such as climate, soil parent material, hydrological conditions, and anthropogenic factors, including irrigation methods and cropping patterns, were examined for their roles in soil salinization.【Result】High evaporation and elevated salt content in the soil parent material are the primary drivers of salt accumulation. In Yaoba Oasis, improper irrigation and cropping practices, coupled with excessive groundwater extraction, intensify soil salinization. In the Twin Well Beach area, early flood irrigation combined with soil moisture leakage led to salinization in the downstream region. Additionally, in areas practicing drip irrigation, the absence of adequate leaching and field drainage creates risks of secondary salinization. To address these issues, we recommend: ① Implementing water-saving irrigation techniques, groundwater recharge projects, crop structure adjustments, and enhanced drainage systems; ② Determining critical groundwater depths and adopting salt leaching and irrigation methods tailored to soil texture and cropping patterns, and improving drainage infrastructure to ensure coordinated irrigation and drainage management.【Conclusion】Effective management of saline soils at the western foot of Helan Mountain requires moving beyond traditional approaches to incorporate tailored strategies that reflect the distinct salinization dynamics of Yaoba Oasis and the Luanjingtan Irrigation Area. This study advocates for a coordinated groundwater management plan emphasizing “source replenishment and salt control” in Yaoba Oasis, alongside an integrated approach combining “water-saving irrigation, targeted salt leaching, and synchronized irrigation-drainage” in the Yellow River irrigation district. Due to the complexity of soil salinization in this region, sustainable reclamation depends on adopting holistic, site-specific practices that integrate multiple control measures and move beyond conventional single-focus water management methods. |
| Key words: Helan Mountain; groundwater; Yanghuang irrigation area; soil salinization; partition governance measures |
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